this topic is only to inform you, that Exiftool version > 9.79 is able to handle filenames with also unicode characters on windows systems by itself.

Please update to latest Exiftool version.Instead of sending the windows file-short-name to Exiftool, you have to send the filename UTF-8 encoded to Exiftool.But you have also to give the option: -charset filename=utf8To get the real filename also in output of Exiftool will be much better than seeing only the windows file-short-name.